Machine for drilling stock.



E. CHILDS. MACHINE FOR DRILLING STOCK.

APPLICATION FILED 0UT.6,1905.

Patented Apr. 27, 1909.

2 SHEETS-SHEET 1.

E. CHILDS. MACHINE PCR DRILLINC STOCK. APPLIOATION FILED 00T. B, 1905.

91 9,823., Patented Apr. 27, 1909.

2 SHEETS-SHEET 2.

'entered by UNITED STATES PATENT OFFICE.

EUGENE CHILDS, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO TRIMONT MANUFACTURING COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

' MACHINE FOR DRILLING STOCK.

Specification of Letters Patent.

Patented April 27, 1909.

Application med october s, l190:5. serial No. 281,590.

Brookline, in the county' of Suolk and State of Massachusetts, have invented an Improvement in Machines for Drilling Stock, of which the following description, in connection with the accompanying drawing, is a speciiication, like characters on the drawings representing like arts.

This invention as for its object the production of a'novel drilling machine to drill a plurality of holes simultaneously in metal objects hereinafter designated by the name of "stock", the stock to be drilled being chucked or held in a suitable manner in a 'iv the shape of which may-vary with the laici@ to be drilled.

-The drills or tools are mounted in drillheads connected with carriages that have coperating with them mechanism for moving the carria es and drill-heads in a direction to cause t e drills to enter the stock and drill holes therein. Each carriage has a plurality of drills, two drills in axial alinement, one drill in each carriage constituting what is designated as a airof drills.

The drills of eac air of drills act simultaneously to drill hofds into the stock from op osite directions, and the extent of longitu inal movement of each drill will depend upon the depth of the holes to be drilled in the stock. The holes may be drilled for any desired depth and the drilling may be stoppedshort of the hloles meeting, or the holes may be connected by imparting longer movement to one drill-head after arrestin the other drill-head, which may be move backwardly to retract its drills Afrom the holes made therein, which holes are to be the drillsv of the drill-head that is continued in operation.

Figure 1 in plan view represents a drilling machine embodying my invention in one particular form; Fig. 2 is a side elevation thereof; Fig. 2a is a sectional detail longitudinally of the gear G4 Fig. 3 `is a detail looking at the right hand end of Fig. 2; Fig. 4 is a sectional detail through the end of the rod d'; Fig. 5 is a side elevation of one ofthe drill heads removed; Fig. 6 is a view of the drillhead, Fig. 5, looking at the same from the right; Fig. 7 is a vertical transverse section through the jig; Fig. 8 is a vertical section through the jig taken longitudinally of the machine, said ligure showing the means for clam ing the stock in the jig and Fig. 9 is a detai hereinafter referred to.

The bed A of the drill has at its upper side usual dove-.tailedl track A', the shape of which is shown in section, Fig. 3, on which is mounted to slidel two carriages'B, B', hav

ing usual bearings to support s indles C, C'.

provided with driving means D", shown as pulleys that may receive belts driven from any suitable countershaft at any desired speed. The s indles C, C', have at their ends respective y driving Gears E, E'.

The underside of each carriage B, B', has a threaded nut a, a', said nuts being engaged respectively by threads of shafts l), b', rotated, as will be described, to move said carriages over the bed A and with them theirv connected drill heads F, F.

' The carria es B, B',are connected respectively with t e drill-heads F, F', by bars c connected with each carriage by screw c',

said bar being secured to each drill-head by other screws c2. The drill-heads each have a series of rotatable drill-carrying spindles 2, 3, 4, and 2', 3', 4', that receive and hold firmly respectively drills 5, 6, 7, and 5', 6', 7'.

The drills 5, 5', constitute a pair, and likewise the drills 6, 6', and 7, 7'. These spindles and their drills are rotated positively from the driving gears E, E', on the driving shafts C, C', said gears engaging positively the larger toothed gears d and d' connected with the chucks 2 and 2. They gears d and d' both alike each have connected with them a mediate pinion d? rotatable about a suitable.

stud d4 sustained in the drill-head. vEach -pinion d3 engages a pinion d5 connected with the intermediate chucks 3, 3'. Each pinion d5 en ages a like intermediate gear d revoluble aout a stud and s-aid gears d each engage a pinion d?, there being one such pinion at the outer end of each of the chucks 2 and 2' carrying the drills 5, 5'. The drill-carrying spindles 4 and 4' which carry the drills 7 and 7 derive their movements from the pinions d2 which with the gears d are fixed on said chuck. v

With the gearing shown in Fig. 5, the drills may be supposed to be rotated at the same` speed, but by changing the pinions d2, d5, d?, for those of other sizes, the drills may be driven at any desired speed, either slower or faster, as the work may require. The chucks may be of any usual or suitable shape corn'- monly employed to grasp` drills or tools and hold them firmly.

The track or, way of the drill-bed has secured to the same between the drill-heads a block G, the latter embracing the usual track and being fixed withl relation thereto. This block is emplloyed to hold the ji of whatever form, t at de ending upont e shape of the stock to vbe dri ed. The jig shown comprises two uprights H, H', each having a dovetailed foot, see Fig. 7, to enter a dovetailed groove in the upper side of the block G. These feet receive a right and left adjusting screw e that may be rotated to move said uprights toward or from each other that i they may clamp in usual manner and center receptlon of a handthe stock to be drilled.

The uprights H and H receive each a plurality of bushin s e in which may slide the ends of the dri as the latter enter the stock, said bushings acting as guides for the drills to hold them steadily up to their work .as the drills are rotated and while they enter the stock. The drill-bed is bored at one 'side or provided with a hole to constitute a bearing for a short shaft G see Fig. 1`, that at its inner end is provided with a miter-gear G2, said shaft at its outer end being provided with a worm-toothed gear Ga that is rotated by a Worrnf on ajshaft f sustained in suitable bearings on the bedl and having, as

shown, a ste ped pulley f2 to provide for driving said s aft at any desired speed. The miter-gear G2 engages other miter gears G, G5, at the-inner ends of screw-shafts b, b', said shafts bein sustained near their inner ends in a suitabel dotted lines and other bearings at the ends ofthe frame. The threaded ortions of the shafts b, b enter the threa ed projections a, a. depending respectivelyfrom the under sides of the carriages B, B', and move said carria es and their connecteddrill-heads, as the drllls enter the stock, as will be described.

The carriages B, B have res ectively projecting ears kg, g Pthat receive oosely a con-- oening G for the trolling-rod g2 havin an lever by which to effect the disengagement of the wormf from the worm-Wheel when the carriage B is to be slid into starting position'. The rod g2 each side the ear g has secured thereto collars g3,`

g, said --rod having a third collar g5 connected therewith at a distance from the ear g The rod g2 also has an attached sleeve g beveled at its under side, see Fig. 2, and extended through the hub g7 of a bearing g8 mounted on the end of the bed and slotted at its under side, see Fig. 3. The bearing gs has a rojecting stud gx on which is mounted a re easlng device gr10 one end of which enters a notch h in the hub h at one end of the bearing 8, one end of said releasing device through the spring pressed pin g20 being held normally bearing Ga represented by against theA beveled under side of the sleeve g. The reduced ends bx of the screwerod b is surrounded by a sleeve 7b3 notched at LZX, see Fig. 4, and united slidably with the hub h having a spline h4 that fits a groove in said sleeve. The hub h has a groove h that is entered by the end of the lever g1 and s aid lever also enters the notch h2* and prevents any sliding of the screw-rod so long as both drills are entering and boring the stock. The end of the screw-rod and the sleeve h are united loosely by 'a screw 24. The underside of the sleeve g is beveled next the releasing device, see Fig. 2, and when said controlling rod occupies the position, Fig. 2, the releasing device occupies a position in the notch h.

The bevel gear G5, shown separately in Fig. 2a, has a longl hub 2O that turns in a hole in the bearing G6 and is prevented from longitudinal movement therein by a collar 21, and the hub 20 'has a spline 22 that enters a groove 23' in the screw b The bearing rm. sustaining the Worm-shaft f is pivoted as at m', see dotted lines Figs. 1 and 2, so that it may be turned slightly when it is desired to lower the end of `said shaft having the worm f to disconnect the Worm from the worm gear G3 fast on the end of the shaft G carrying the bevel pinion G2 and the hand-wheelf5- The bearing m has a projection m2 that when all the drills are entering the stock, is engaged by a latch fm3, pivoted at m4, in the stand mxthe u per end of the latch entering the hole g in t e controlling rod.

In operation let it be assumed that Fig. 1 shows the parts in substantially the position occupied when the machine is ready to be started, and it will be noticed that the collar g4 is located at a distance from-the ear g and that the collar g5 is located at a farther distanbe from the ear g. The rotation of the shaft f rotates the shaft G and causes its bevel-'gear G2 through the bevelears G, G5 to rotate the screws b, b', and t ese screws cause the two carriages B and B and their connected drill-heads provided with the described drills or tools, to be moved toward each other that the points of the drills may enter the stock held in the jig. At the proper time after the carriage is started, the ear g meets the-collar 4 and starts the rod g2, but before the drills ave entered the stock from its o posite side far enough for the ends of the grills to meet, the rod g2 is moved far enough to cause the beveled under side of the sleeve g to meet one end of the releasinglever g1- and' turn the same so that said releasing-lever retires from the notch hzx in the sleeve h3. Just after the releasing-lever is moved as described, .to release the sleeve, the collar g*5 contacts with the ear g of the carriage B and starts said carriage backwardly or to the' right, viewin Fig. 1, withdrawing the drills from the holes in the stock, and

during the retiring movement of the carriage B and the connected drill-head F the carriage B and drill-head F continue to move in the same direction until the holes drilled by the pairs of drills are opened into one, or the stoc between the holes drilled by the two drills of the pair is removed. The turning of the releasing-lever'as described permits the sleeve h3 to slide in the bearing h', and the screw-rod b', the rotation of which is continued, to slide in the hub of the bevel-gear G5 as the nut a of the carriage B is being pushed backwardly by the collar g5. As the carriage Bl completes its backward stroke through the controller-rod, one end of the slot gX thereon meets l,the up er end of the latch and turns the same to re ease the bearing-bloclim2 and disconnects the worm from the worm-gear. Preparatory to starting the machine for another operation the hand-` wheel will be turned in a direction to cause the screw-rod b to bring the carriage and drill-head B and F into starting position, such operation of the hand-wheel and shaft G turning the screw-rod b in the nut a and thereby giving a longitudinal movement to the sleeve ha. As soon as the sleeve h3 reaches the-position shown vin Fig. 4 the releasing lever g10 is forced into the notch h2 by the spring g2 thereby locking the screwerod b against longitudinal movement. When this occurs the carriage B will be moved' back to its initial position along with the carriage B.

The carriages, the two screw-rods, their actuating means, and the rod g2 are common to other drills wherein each carriage actuates but a single drill, but by the addition to a drill of the class referred to of the drill head containing a plurality of drills and gearing for rotating the same, itis possible to bore a plurality of holes in stock at each inward movement of the` carriage.

Havin described my invention, what .I claim an desire to secure by Letters Patent 1s 1. In a machine of the class described, a pair of tool-carrying devices, .a head to sustain each tool-carrying device, means to rotate said devices, actuating means to move said heads forwardly toward each other, means both to render inoperative the connecwtion between one head and the actuating means before the other head completes its forward movement and to connect said heads together whereby the 'first named head is given a reverse movement during the final movement of the latter head.

G0 heads, a carriage for each drill head, means the tool-holdmg device of the associated dril head, a lead screw for each carriage, means actuated by one carriage before it .completes its forward movement to render the lead screw for the other carriage inoperative and to reverse the direction of movement of said other carriage during the final movement of said first named carriage.

. 4. In a device of the class described, a air of heads, `a drill-holding device .sustaine b each head, a leadscrew formoving said hea s toward each other, a thrust rod connected withand actuated by one head, and means operated by said thrust rod to render inoperative .the connections between the other head 'and its lead screw before the first named head completes its lforward movement.

5. In a device ofthe class described, a (pair of heads, a drill-holding device sustaine by each head, a lead screw for moving said heads towardeach other, a thrust rod connected with and actuated by one head, means operated by said thrust rod to rendeninoperative the connections between the other head and its lead screw before lthe first named head completes its forward movement, and means associated with the thrust rod to ositively move the latter head backwardly uring `the ilnacl1 forward movement of the first named 6. In a machine of the class described, two heads each having a drill-holding device, a lead screw'for each head, means to `rotate the lead screw to move the heads toward each other, a releasing device associated with one lead screw to operatively connect or discon- 'nect said lead screw to its corresponding head, and means actuated by the other head to lactuate said releasing device before said other head completes its forward movement.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

EUGENE CHILDS.

Witnesses GEO. W. GREGORY, LoUrs C. SMITH. 

